aikman



B. S. AIKMAN.

PUMP AND PUMPING'SYSTEM.

APPLICATION FILED DEC. 1. I919.

Reissued Spt. 7,1920;

3 SHEETS-SHEET I.

llllllll waefmiu y arm B; s. AIKMAN.

PUMP AND PUMPING SYSTEM.

APPLICATION FILED DEC. 1. 1919.

Reissued Sept. 7, 1920.

71 Z/zam mwd 1 di f? 8. S. AIKMAN.

PUMP AND PUMPING SYSTEM.

APPLICATION FILED DEC. 1. I9I9. Reissued Sept. 7, 1920.

4 ,Z%%% 5 u 4 W Q7, mg l w ak w& H u M Z QJOIIJW ay 3 4 6 wm 5 4 Z i AV?UNITED STATES PATENT OFFICE.

BURTON s. AIRMAN, 0F MILW UKEE, WISCONSIN, ASSIGNOR 'ro NATIONAL BRAKE;& ELECTRIGCQMPANY, 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

PUMP AND PUMPING SYSTEM.

Specification or Reissued Letters Patent. Rei s d S t 7' 1920 OriginalNo. 1,253,558, dated January 15, 1918, Serial No. 51,524, filedSeptember 20, 1915. Application for reissue filed December 1, 1919.Serial No. 341,805.

To all whom it may concern:

Be it known that I, BURTON S. AIKMAN, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented a certain new and useful Improvement in Pumpsand Pumping systems, of which the following is a full, clear, concise,and exact description, reference being had to the accompanying drawings,forminga part of this specification. y

My invention relates to pumps and pumping systems and contemplates animproved apparatus which may be employed as an isolated plant forfurnishing water to a residence or an industrial establishment from anearby source, such as a well.

It is the purpose of my invention jtopr'ovide an improved system whichsupplies water fresh from the well, that is,'without the intervention ofa storage or reserve tank,

and which will be under faucet control,

by which I mean that "the flow of water is controlled by the acts ofopening and closing the faucets which form the supply outlets of thesystem.

To supply water fresh from the well and to maintain the flow of waterunder faucet control is broadly a matter of prior art. The apparatus andsystems heretofore known and used were, however, subject to inherentdifficulties due to the fact that the pneumatic control employed led tofrequent misoperations, such as are commonly called blow overs, wherethe system becomes cleared of water and the compressed air employed asan operating medium is wasted.

Faucet control of water delivery in a system employing a single cylinderpump is shown for the first time in my co-pending application, SerialNo. 50,941 filed September 16, 1915.

Faucet control of a water supply system' vide a single cylinder pump andan air spring or auxiliary pumping chamber to fill in the gap betweenthe discharge strokes of the single pumping cylinder.

A further problem is a requirement, the necessity for which does notarise in open pumping; namely, that the valves of the pump be made sothat they will prevent leakage either of air or of water. In the presentcase the main valves are all provided with yielding faces and seat insuch a manner that-the pressures which they are to retain tend to holdthem tight upon their seats. I

Another problem in the matter Offaucet control is the matter ofcompleting the throw of the air valve mechanism from air admission toexhaust position, or vice versa. In open pumping the rise and fall ofwater in the pump is quite rapid and no particular diflicultyisen'countered in shifting the air valve or valves. In a faucetcontrolled system the flow of water may cease or be greatly diminished,as by the closingof the faucets just at the critical point in theoperation of the pump where starting of'the valve, shifting motionshould begin. Conse quently, unless some means is provided for makingthis shifting operation independent of the rate of water discharge, thepump will center and the air will blow away, leaving the system dead.Some means must be provided for starting the valve shifting op-' erationat a predetermined stage of operations, such for instance as low levelon discharge or high level on filling of the pump, and some means mustbe provided for insuring a complete operation or full stroke of thevalve Operating mechanism after the shifting operation is initiated.

A furtherrequirement is a valve shifting means which shall invariablyhave sufficient power to operate the valve mechanism even. on high airpressure. As previously explained, where the air valves are held to seatby pressure, it is essential that the means for shifting the valves beinvariably powerful enough to move the valves regardless of the pressurein the pumps This I accomplish by the use of apressure motor operated bythe same fluid pressure which tends to' hold the valves to seat. r 1

The conjoint use of the valves held to seat by pressure andthe fluidpressure motor for pulling the valves from seat against pressure, asherein described and disclosed,

from, the alternations being secured by the actuations of valvemechanisms, which in turn, are dependent, on the one hand, di.'

rectly and. mechanically upon the fall of the water in the chamber, andon the other hand upon a positively operating time element device.

It will be understood that the system is constantly under pressure, andit is, therefore,- a further object of my invention to provide anapparatus which will be as free from leaks as possible, which operateswith a minimum consumption of air, and which operates reliably andpositively.

Notwithstanding the gradual rise and fall of the water in the chamber, Iprovide means for suddenly actuating the valve mechanism, an especiallydesirable feature.

My invention is illustrated in the accompanying drawings, in which:

Figure 1' is a more or less diagrammatic view illustrating the systemas-a whole; Fig. 2 is a plan view of the pump; Fig. 3 isa vertical axialsectional view taken on the .plane of the line 3-3 of Fig. 2 and lookingin the direction'indicated by the arrows;

'the plane of the line 55 of Fig. 2 and looking in the directionindicated by the arrows, Figs. 2 and 5 being drawn on a larger scalethan Figs. 3 and 4.

Referring first to Fig. 1, which, as before stated, is diagrammatic, itwill be seen that the well curbing is illustrated at 8, the water levelbeing indicated at 9. The pump structure, which I have indicated broadlyby the reference character 10, is disposed in the-well at a suitabledistance below the water level therein, as will be described,

The pump structure has leading therefrom threepipes, an air pressurepipe 11, an exhaust pipe 12, and a water discharge pipe 13. The airpressure pipe 11 is connected with a compressed air tank 14, in whichair is'compressed by means of a compresser 15, operated, for'instance,by an electric motor 16. It will be clear to those skilled in theartthat the compresser 15 may be operated by any suitable means, such as agas engine Y or steam engine, and if desired, means may be providedfor'automaticallystarting and stopping the prime :mover dependent uponlation' in a residence, for instance.

the fall and rise of pressure in the tank 14.

In the pipe 11 the cut ofi valve 11 air turn leadstoan outlet faucet 19.By means of a pipe 20 the discharge pipe 13 is connected with a chamber21, called an air spring and closed except for the entry pipe 20, for apurpose which will be pointed out presently; I

It will now be understood that this system represents an isolated plantfor ins f alle water discharge pipe leads from the well convenientlynearby, to the distribution pipe in the building, and the compressor,motor, compressed air tank and chamber are suitably'housed inanyconvenient way.

As-before pointed out, air pressure is con stantly maintained upon thesystem. It is therefore necessary to maintain a certain pressure betweenpredetermined minimum and maximum limits in the compressed air tank 14,this being done by theproper starting and stopping of the compressor 15,

either manually or automatically. It has sired limits.

It will appear as this description proceeds that with the pressureproperly maintained upon the system, everything is at rest so long asall the outlet faucets 'of the system are closed, but as soon as one ofthem is opened the pumping 'mechanism will operate to maintaincontinuous the .flow which immediatelyjcommences. When the faucet is,again closed the apparatus comes to rest and. it will appear that thefeed has been direct from the well with the proper pressure todistribute it to whatever points desired.

I refer now to Figs. 2 to 5 inclusive, to describe the pumpingmechanism. A head member 22 and a primary base member 23, both ofcircular form, are jointed by a cylindrical housing '24, which forms a'water chamber 25. As illustrated in Fig. 4, the head member 22 and theprimary'base member 23 are tied together by means of two" pipes 26'26,which thread into the head member 22and pass through'openings in theprimary base member'23,the lower ends of these pipes being screwthreaded for the reception of nuts 27 which, when tightened, clamp thehousing 24 firmly in place to form a watertight and airtightcompartment. Secured to the under side of the primary base member 23, bymeans of screws 28-28, is the secondary base member 29, which hasextending downwardly therefrom a central boss 30 to which a nut 31 isscrew threaded, a conical screen 32 being clamped between the nut 31 andthe boss 30 and thus held against the under side of the secondary basemember 29. The secondary base member. 29 is provided with two waterinlet openings 33-33, each of which is controlled by a lift valve 34,normally held seated by means of springs disposed between the respectivevalves and the primary base member 23.

The primary base member 23 is provided with an axial opening 37 which issurrounded by an upwardly extending boss 38, a cylinder 39 beingsupported upon and extending upwardly from said boss, as clearly shownin Figs. and 4. The top of the boss 38 forms a valve seat 40, and thisvalve seat is adaptedto be engaged by the ball float valve 42, whichisconfined within the cylinder 39. As shown in Fig. 3, the top of thecylinder 39 is closed for the proper retention of the ball float valve42. The cylinder 39 is provided with elongated vertical slots 43,

through which the water may pass inwardly and outwardly, as will bedescribed. En

trance of water into the chamber 24 is thus provided through the screen32, openings opening 37, and slots 4343. The

exit of water from the chamber 24 is provided for through the slots4343, the opening 37, the passageways 4444, formed by the spiderconstruction of the top of the nuts 27-27, and the pipes 26- 26, thefurther course of the water being later described.

The head member 22 is provided with an atmosphere passageway 47, thecompressed air inlet passageways 48 and 49, the primary water chambers50-50, and the secondary water chamber 51. These passageways andchambers are isolated fromeach other, as will be described, theatmosphere passageway being connected with the pipe 12, the compressedair inlet passageway 48 being connected with the pipe 11, andthesecondary water chamber 51 being connected with the discharge pipe 13.

Referring first to the exhaust passageway 47, it will be seen that it sofashioned as to lead to the annular opening 52 in the bottom of the head22, a valve seat 53 surrounding this opening.

Supported from the under side of the head 22 is an annulus 54, disposedcoaxially with the cylinder 24 This annulus forms a water chamber 99 andsupports a diaphragm cham ber structure which will now be described.This structure is composed of two primary parts 55 and 56, the formerbeing mounted in and closing the bottom of the annulus 54 and the latterbeing secured to the under side of the former with the diaphragm 57'upper rim below the exhaust passagev 52 so that the incoming wateroverflows the rim of the annulus at each filling stroke. The top edge orvalve seat 70 of the upwardly extending rim 64 lies below the edge orrim of the annulus 54 so that the water which is trapped above the rim70 is forced down into the motor diaphragm chamber 58 at each downwardmovement of the diaphragm. Upon upward movement of the diaphragm thewater or part of it is first expelled through a restricted opening 90,as will be described later and as the valve face 96 leaves the seat 76the pressure is relieved within the motor diaphragm chamber 58 as willbe described later. The forcing of the water through the opening 89provides sufficient delay of the shifting of the valves to permit thechamber to fill with water. This motor chamber 58 and its adjuncts thusforms in effect a liquid dash pot for securing the desired delay in theshifting of the valves. i

' A valve stem 65 is screwed into a guide block 66, which, asillustrated in 3, is mounted for reciprocation in a sleeve 67, disposedcoaxially in the opening 52. A valve 68, double faced with a yieldingmaterial such as rubber so that it acts as a valve on both sides, isclamped upon the valve stem 65 between the block 66 and 'a collar 69.The upper valve face coiiperates with the valve set 53, and the lowerface cooperates with the valve seat 70 formed at the top of the rim 64,as will be described 7 presently.

Mounted so as to be engaged by the block 66 is a valve stem 71, whichconnects the compressed air passageways 48 and 49. A valve seat 73surrounds the passageway 72, and a valve 74, carried upon the stem 71,coiiperates with this valve seat. The face of the valve 74 is alsoformed of a yielding material such as rubber. The valve 74 is guided ina central opening 75 at the top of the head member 22, which opening isclosed by a plug 76, between which and the valve a spring 77 isdisposed. i

The lower end of the stem 65 extends downwardly into the cup member 61,wherein it is provided with a head 78, adapted to be engaged by thebottom of the cup memmember. or cage is made in the form of a spider, inorder to permit of the insertion of this; head member.-v A spring'79 isdis posed between a collar 95 on the head member and the under side ofthe top of the on -member or cage.

he bottom of the diaphragm chamber 59. is closed by a partition 80,between which and the under side of the diaphragm 57 a spring 81 isdisposed. An opening 82 is opening being controlled by a relief valve83, carried upon a stem 84, guided in the opening 82, by means of ribsor lands 85 on the valve stem .84. As will be described, the top of thestem 84 is adapted to'be engaged by the screw 62, in thedownwardmovement of the diaphragm, to open the valve 83 against the tension ofthe. spring 86. The chamber 87 below the partition 80 is connected bymeans of a small passageway 88 with the atmosphere passageway 47'.

The upper diaphragm chamber 58 is provided with a restricted outlet 89,which affords a time element in the return of the diaphragm 57 from itslower to its upper position, the interval thus provided for beingutilized for the refilling of the pump.

The operation ofmy pump and system is as follows:

Let it be assumed that-the pump is submerged in the water of the well asillus-- trated in Fig. 1 and that the proper pressure issupplied by thetank 1 1. As soon as one of the faucets 19 is opened water at once flowstherefrom and in doing so re-' lieves the pressure within the air spring21, 1

- thus relieving the back pressure of the water V in the pump chamber 25and permitting the 40' discharge of water therefrom. Assuming that thepump is on the discharge stroke the water inlet valves 34 are closed andheld closed by pressure, the Water dischargevalves 92 are forced open bythe discharge of water. The air admission valve 74 is held open by thestem 71 thereof being held by the block 66. -'The exhaust valve 68 isvheld closed, being applied to its seat by the spring 81, and also heldby the pressure-ofthe compressed air within the chamber 25. The

relief valve 83 is closed and held closed by the pressure of the spring86 so'that the pressure of the water in the discharge main prevails inthe motor chambers 59 (because of the communication through thepassageway 90). the seat 70 so that the water caught in the annulus 5 1communicates with the motor chamber 58;

In thecondition shown in Figs. 3 and 4 the'apparatus has just reached apoint in the discharge stroke where the consignment of water in thechamber 24 has been driven therefrom by the action of compressed airmeansof the" spring 81. 'the action reaches the point illustrated in Thevalve face 96- is away from sure within the chamber 25.

ing 37 and upwardly through the pipes 2626, the air pressure was noteffective in its action upon the top of the diaphragm 57 for the reasonthat the pressure is also transmitted to the under side of the diaphragmby way of the passageway 90 leading from the diaphragm chamber 59 to oneof the chambers 50, as shown in Fig. 4.

It will be obvious that while the expulsion operation is going on thewater in the chambers 50 is under the pressure of the compressed air,and, since that pressure is transmitted to the under side of thediaphragm 57 by means of the passageway 90, the diaphragm will bebalanced so far as effective air pressures are concerned and will beretained in its uppermost. position by When, however,

Figs. 3 and 4, the pressure of the motive fluid on the under side of thediaphragm 57 is cutoff by the valve 42 and the pressure on the upperside of the diaphragm builds up until it easily overcomes the tension ofthe spring 81, and the pressure of the water in chamber 50. This movesthe diaphragm 57 toward its lowermost position compressing the spring79. The pressure of the compressed air in the chamber 25 is exerted uponthe water which is trapped in the cup formed by the annulus 5e and asthe pressure in the chamber 25 becomes higher than the pressure in thewater discharge chamber 50 the difference in pressures upon themotordiaphragm ovecomes the springs 81 and 79 forcing the diaphragmdown, injecting some of the water trapped in the annulus 54 down intothe motor chamber 58 and ejecting some of the'water in the motor chamber59 out of the orifice 90. The first movement of the diaphragm 62 andattached spring cage 61 downward removes the effect of the spring 81upon the exhaust valve stem, so that the valve 68 is held against theexhaust valve seat solely by thepres- Further movementof the diaphragmand cage compresses the spring 79 between the top of the cage 61 and thehead 95on the end of the exhaust valve stem 65. I I

Further movement of the diaphragm 57 next causes engagement of the screwhead 62 with the stem 84 of'the relief valve 83 permitting the pressurein the chamber 59 and under the. diaphragm.5 7 to escape to exhaustthrough thepassagewaySS. Then suddenly the motor diaphragm is'raised toits full power and moves down very rapidly further compressingthesprings 79,- 81 and 86-and further opening the relief valve 83. The fullpower of the motor is developed at this stage in order-to enable it topull the exhaust valve ofi ofits. seat against the :pressure of'theCOIIIPIBSSBClalI'lIl the cham- As soon as the valve isicracked thepressure escapes from the chamber 25 rapidly and tends to equalize onboth sides of the exhaust valve 68 until a point is reached vwhere thedifference in pressure upon the two sides of the valve are insufficienttoovercome the tension of the compressed spring, 79. Finally the springovercomes the pressure 1101d ing valve 68 toward its seat and suddenlyexpands. In this downward movement of the diaphragm three changes occur.The valve 83 is moved to its open position by reason of the engagementof the screw 62 with the top of the stem 84. The valve 68 is :broughtdown on theseat 70,because of the engagement of the top of the head'78with i the under side-of the top of the cup member 61. -The valve 7a isbrought down on theseat 73. This action opens thev water chamber to theatmosphere and closes off thecom-v pressed air to the waterv chamber 25.At the same time the under sideof the diaphragm 57 is exposed to theatmosphere for exhaust. sumed the, chamber 25 immediately commences tofill, check valves 34L35 opening 1;- under the head-of waterv in thewell, and

this action continues until the valves are. again reversed. I providefor this refilling, period as follows: It xwill be seen that, as; soonas the valves have been thrown in their lowermost position, thediaphragm 57 will immediately begin to rise under the influence ofth'espring 81.- It is retarded in resuming,

this position, however, ,because the vwater inthe diaphragm chamber: 58mustall find its way out-through the restricted passagel/Vhen theseconditions are asphragm chamber 58;. Assoon as the com-. pressed air hasescaped from the main pump chamber 25. (and this occurs very rapidly)the water from the well immediately flows intothepump due tothesubmergence ressure-and tends at once to fill the c am- I ber 25.. a

' As the valve 68is down upon its seat 7 O andas thesoring 79 tends tohold the valve in that position, and. asthe area of the valve is smallerthan thevarea of the diaphragm, the pressurevofthe spring 81 uponthediaphragm 57- does not create sufiicient internal fluid pressure in thechamber, 58 to .force the valve (SS-upwardly off-ofthe seat 70 and 'so.- a

consequently acertain amount of delay is created in the closing, of theexhaust valve which ldelay. suffices. for the filling of the pumpchamber25 from the well.- The action of the timewelement'creating the delay isas follows: \Vhen the valve face 69 is first brought against the valveseat 70 it will be recalled :thatthe top ofthecage has come intoengagement with the head 78-of the stem, 65 forcingthe valve down. Inother words the lost motion between these parts was taken up in onedirection and before the valve face 69 can be'forced 0H of the seat 7 Othelost motion must be taken up in the reverse direction.v Thespring 79having been compressed between the collar and the topof the cage 91 nowexerts pressure in two directions first the pressure on the valve 68 ina downward direction tending to hold the valve on the seat 70 and itexerts an upward pressure on. the diaphragm 57 tending to compress thefluid in the motor chamber 58. The pressure of the spring 79 distributedover the small area of the valve face 69 seated on the port 70 ismuchgreater per unit of area than is the pressure of the same spring perunit area distributed over the large area of the diaphragm 57.Consequently if no other influences operated and ifithe chamber 58 :wereotherwise tight the valve 68 would remain seated on the valve seat 70.However, I have provided means for permitting the fiuid pressure withinthe chamber 58 to escape Theorifice-89 in the walls ofthe chamber 58permits the fluid to escape. However, if no further means were providedthe spring :79 would bring the diaphrag n57 up, discharge the liquidthrough the hole 89 and bring the bottom of the cage 61 againstthebottomof the head 78. This would not .open the admission valve 74; nor

closetheexhaust, valve 68.

The. spring. 81 below the diaphragm 57, and the spring 86 working on therelief valve 83, .aid the spring 79in forcingthe diaphragm upwardly toexpel the liquid through the hole 89, and when the spring 79 has broughtvthe. cage 61 into engagement withtheiend ofthe head 78the work of.

the spring 79 ceases and the valve 68is'free;

to rise from the seat 70, and the pressure of the spring 81 instead ofbeing transmitted to-the liquid is applied solely to the stem 65. Thespring 86 aids the spring 81 to the limit of the upward movement of thevalve 83. This occurs atsubstantially the same time that the lost motionis taken up between the cage 61 and the end of the valve stem 65. Thework of the spring 81 then consists in opening. the admission valve 74against the live air pressure above it and closing the exhaust valve 68.After the valve 74 is cracked from its seat it moves away easily and thespring 81 throws it suddenly causing a snap action shift of both valves74 and 68. As pressure then enters the chamber 25 to discharge the watertherein the pressure on the upper side of the diaphragm 57quickly'builds up to equal the pressure on the lower side thereof andthe opening 89, and I am therefore enabled to after the diaphragm 57 hasmade a consider-.

provide whatever time is necessary for re filling, dependent uponconditions.

It has been my experience that, with a structure builtsubstantiallyalong the lines of that illustrated in the drawings, and substantiallyof those proportions, submerged a few feet below the level of the waterin the well, a period of about 1.5 seconds is re-' quired for thefilling operation, and I therefore regulate thesize of the aperture 89to permit of a period of that time for the up ward movement of thediaphragm 57 before the head 78 is engaged by the bottom of the cupmember 61 to throw the valves in their upward position.

It is pertinent here to point out-that the stem 84 of the valve 83 isnot engaged until able downward movement and, conversely, is releasedafter a small portion of the upward movement of the diaphragm has beenaccomplished. The downward movement of the diaphragm and the opening ofthe valve 83 releases the water confined there, and in the upwardmovement of the diaphragm the valves closes,- under the followingtension of the spring86, to retain the water above it. It may beassumed. that in this refilling operation which has been described thewater reaches the level indicated by the dot-anddash line, at which timethe valves are reversed so as to close the chamber 25 to the ,atmosphereand open it to the compressed air.

the check valves 9292, and into the sec= onda ry water chamber 51, thesecheck valves beingheld on their seats under normal conditions by meansof the springs 93-93, dis-' posed between the valves and the plugs94-94.

'From the chamber 51 the water passes to the distribution system bywayof the pipe 13. This operation then continues until the float valve 42is brought down to the seat 40, whereupon the valves are reversed andthe operation hereinbefore described is repeated.

It is assumed, of course, that this oper .ation which has been describedtakes place only when there is a withdrawal of water from'the system. Ifall the outlets of the distribution system are closed, everything willbe at rest since, although there is pressure on the top of the water inthe chamber 25, there is no outlet for the water. When the water isforced out through the discharge pipe 13 it will be seen that, in

addition to going to the distribution pipes 17 and 18, the water willalso be forced into the air chamber 21, confining an air cushion abovethe water level formed therein, as

indicated in dotted lines.

The speed with which the water chamber fills to the level ofcoursedepends upon the sizes of the inlet passageways and the head ofthe water in the well. cated, with a structure as shown, the time isabout 1.5 seconds. discharge and distribution pipes is great enough thismomentary cessation of pressure will be hardl perceptible at thefaucets, particularly since the expulsion period, assuming one or morefaucets to be open for a considerablev length of time, consumespractically all of the time. However, in order that the gap in the flow'may be properly filled in, I provide'the air chamber 21, to which thepart 20 delivers from water in the discharge pipe 13 is under pressure,as it is, practically all of the time, a certain'amount of water isforced up into the chamber 21 This action compresses the air in thechamber and forms a cushion, which is maintained so long as the pressureis not relieved. As soon as the pressure is relieved, however, by thecessation of pressure in the pump with a faucet open, the

If the capacity of the As before indi- 120 the discharge pipe 13.Obviously, whenthe airis given opportunity to expand and in doing soforces out the water which: has become packed therein and provides aflow from the faucet during the refillingperiod of the pump.This'chamber 21 will, of

course, be distinguished from 'a storage tank,

in the chamber 21 is kept properly replenished by bubbles of air whichfollow the expulsion of water from the water chamber 25' of the pumpstructure, and that it is automatically relieved from an excess of airby theopening of a faucet, this latter action' being instantaneous andimperceptible to the opening of the faucet. The air spring 21 thusoperates like another pumping chamber in a double cylinder pump.

It will be seen that the lower level of'the.

water in thewater chamber positively determines the reversal of thevalves, and that the upper level of the water is determined by apositively and uniformly operating time element. In this way-reliableoperation is secured and the desirable sudden action of the valve at theend of a refilling or emptying operation is effectively obtained.Suction may be applied on the pipe 12, if desired. Certain of the broadfeatures of the present invention are disclosed and claimed in my priorcopending application, Serial No. 50,941, filed September 16, 1915.

-I have endeavored to embody the features of my invention in a simplestructure involving a minimum number of parts of simple design, and someof the more limited of the appended claims are directed to these morespecific features.

Iclaim: V

1. Ina pump, a water chamber, an auxiliary chamber having inlet andoutlet valves said auxiliary chamber being connected with said waterchamber, an exhaust port for said water chamber, a compressed air portfor said water chamber, valves for.

said ports, pressure means for operating said valves, one side of saldpressure means being exposed to the pressure in said auxiliary chamberto close the exhaust port and open the compressed air port, and theother side being exposed to the pressure in that this water said waterchamber to open the exhaust port andkclose thewcompressed airport, and avalve for controlling the connections be- I tween-said chambers.

2. In a pump, awater chamber, an-aux- H iliary chamber having inlet andoutlet valves said auxiliary chamber being connected with said waterchamber at thebottom of the latter, an exhaust port for said waterchamber, a compressed air port for i said waterchamber, valves for saidports, pressure. means for operating said valves, one side of saidpressure means being ,ex-

posed to thepressure in said auxiliary chamher to close the exhaust portand openthe compressed air port, and the other side being exposed to thepressure in said-water chamber to open the exhaust port and close thecompressed air port, and a float valve for controlling the connectionsbetween said chambers.

3. In a pump, a water chamber, an auxiliary chamber having inlet andoutlet valves said auxiliary chamber being connected with said waterchamber,-an exhaust port for said water chamber, a compressed air portfor said water chamber, valves for said ports, pressure means foroperating said valves, one side of said "pressure means being exposed tothe pressure in said auxiliary chamber, and the other side being exposedto'the pressure in said water chamber, avalve for'controlling theconnections between said chambers, and a valve for controlling theapplication of the pressure in said water chamber to said pressuremeans.

4. In a pun1p,a water chamber, an auxiliary chamber-having inlet andoutlet valves said auxiliary chamber being con-' nected with said waterchamber, an exhaust port for said water chamber, a compressed air portfor said water chamber, valves for said ports, pressure means foroperating said valves, one side ofsaid pressure means being exposed tothe pressure in said auxiliary chamber, and the other side being ber, avalve for controlling the connections between said chambers, a valve forcontrolexposed to the :pressure in said water cham- Y ling theapplication of the pressure in said 1 water chamber to said pressuremeans, and

means and, controlling said exhaust and compressed air portsand saidmain pasisa-geway. 1

6. In a pump, a waterchamber, anauxs iliary, chamber having inlet andoutlet valves said auxiliary. chamber being con nected' with.- saidwater chamber, anzexpressed air port; for said water chamber, pressuremeans connected on oneside With the auxiliary chamber, and on the otherside connected with the interior of the water chamber by a main and arestricted passage-v way, a valve structure operated by saidpressuremeans and controlling said exhaust and compressed air ports and saidmain passageway, and an exhaust relief passage -from the first namedside ofsaid pressure means; I

"7. In a pump, a water chamber, an auxiliary chamber having inlet andoutletvalves said auxiliary chamber being connected with said waterchamber, an exhaust port for'said water chamber, a compressed air portfor said waterchamber, pressure means connected on one side with theauxiliary chamber, and on the other sideconnected with the interior ofthe water chamber by a-main and a restricted passageway,

a valve structure operated by said pressure means and controlling said;exhaust and compressed air ports and said main pas-,

sageway, and a float valve controlling the connection between said waterchamberand said auxiliary chamber; I

8. In'a pump, a water chamber, an auxiliarychamber having inlet andoutlet valves said auxiliary chamber beingconnected with said waterchamber, an exhaust port for said Water chamber, a compressed airportfor saidwater chamber, pressure means connected on one side with the-auxiliary chamber, and onthe other side con-.'

nected with the interior of the water chamber by a main anda'restrictedpassageway,

. a valvestructure operated by said pressure means and, controllingsaid" exhaust and compressed air ports-and saidamain pas sageway toclose the exhaust port, open the compressed air port, and open said mainpassageway in one'direction and reverse the action in the oppositedirection.

9. In a. pump, a water-chamber, an auxiliaryv chamberhaving inlet andoutlet valves said auxiliary chamber being connected with said waterchamber, an exhaust port forsaid water chamber, a compressed air; portfor said water chamber, pressure means connected on one'side with theauxiliary chamber, and'on the other side con-. nected with the interiorof the water chamber by a main and a restricted passageway, a valvestructure operated by said pressure means and controlling said exhaustand compressed air ports and said main pashaust port for said waterchamber, a? com- 7 ,means connected on one'side with theauxiliar-ychamber, and on-the other side connected with the interior ofthe water chamber by a main and a restrictedpassageway, avalve structureoperated by said pressure means and controlling said exhaust andcompressed air ports and said main passageway to'close the exhaust port,open the compressed air port, and open said main passageway in onedirection and reverse the action in the opposite direction, and a floatvalve controlling the connection between the water chamber and said auxliary chamber.

[11. In the pump, a water chamber, an

auxiliary chamber having inlet and outlet valves said auxiliary chamberbeing connected with said water chamber, an exhaust port for said waterchamber, a compressed air port for said water chamber, pressuremeansconnected-o'n one side with the auxiliary chamber, and on the otherside connected with the interior of the water chamber by ama'in and arestricted passageway, a valve structure operated by said pressure meansand controlling said exhaust and compressed air ports and said mainpassageway, said valve structure being moved by the latter portion ofthe movement of said pressur'emeans. I

12.-In a pump, a-water chamber, an aux-v iliary chamber having inlet.and outlet valves said auxiliary chamber being connected with said-water chamber, an exhaust port for said water chamber, a compressed airport for said water chamber, pressure means connected on one sideW1th-the auxiliary chamber, and-on the other side connected with theinterior of the water-chamber by a main and a restricted passageway, avalve structure operated by said pressure means and controlling saidexhaust and compressed air ports and said main passageway, and afloatvalve controlling the connection be'tween said-water chamber and saidauxiliary chamber, said float valve being confined for vertical movementin a cylinder through which water may pass.

113. Incombination, a pumping chamber havingxwater inlet and dischargevalves, compressed air admission and exhaust valve means, a fluidpressure motor for operating the air valvemeans in one direction and ameans time controlled element governing the return only of said airvalvemeans.

'14. In combination, a pumping chamber having'water inlet and dischargevalves, an

air, admission valve, an air exhaust valve,

spring means for applylng the exhaust valve to its seat and a timecontrolled element governing the operation of said spring Incombination, a pumping chamber having water intake and discharge valves,

an an admission valve, an air'exhaustvalve, spring means for opening theair admission valve and a time control device governing the operation ofsaid spring means.

[16. In combination, a pumping chamber having water admission anddischarge valves, a compressed-air admission valve, means governed bylow level conditions of the Water in the pumping chamber for closing thecompressed air admission valve, means for opening the air admissionvalve and a time controlled element governing said latter means.

17. In-combination, a pumping chamber having water admission anddischarge valves, a compressed air admission valve, means controlledbylow level conditions in the pumping chamber for closing said'airadmission valve, and time controlled means for opening said airadmission valve.

18, In combination, a pumping chamber having water admission anddischarge valves, an air admission port, an air admission valve adaptedto be held against said port by the pressure of said compressed air,means controlled by low level conditions within the pump for permittingsaid valve .to move to seat when the water has been discharged from thepumping chamber, time controlled ,means foropening said air admission'valve, said means comprising a,

spring adapted to throw the air admission valve away from its seat.

,19. In combination, a pumping chamber having water inlet'and dischargevalves, an air admission valve adapted to seat with the air tending toenter the 'pump. chamber,

an air exhaust valve adapted to seat with the' air tending to leave thepump chamber, a fluidpressure'motor for opening the ex haust valveagainst pressure and for closing theadmission" valve with pressure whenwater has been discharged from the pump element.

20. In combination, a pumping chamber.

cli amber, and means for causing'the opening of the admission valveagainst pressure and closing of the exhaust valve with pressure, saidlatter-means having a time controlled having water inlet and dischargevalves, an

air-admission valve adapted to seat with pressure tending to enter thechamber, and

an air exhaust valve adapted to seat with pressure tending to leave thechamber, a v

fluid pressure motor controlled by low level conditions within thepumping chamber for seating the admission valve with pressure andopening the exhaust valve against pressure, spring means for opening theadmission valve against pressure and seating the exhaust valve withpressure and a time controlled element governing said spring I means.

21.. In combination, a single vpumping chamber having water inlet anddischarge valves, an air admission valve, anair exhaust valve, said airvalves being of the puppet type, a fluid pressure motor for opening theexhaust-valve when water has been expelled from the pumping chamber andmeans for opening the air admission valve a predetermined time intervalafter the opening of the exhaust valve. I

22. In combination,.a pumping chamber having water inlet and dischargevalves, means for admitting compressed air tothe pumping chamber, anexhaust valve, a fluid time controlled means governing the applicationof said exhaust valve to its seat.

24:. In combination, a pumping chamber having water inlet and dischargevalvespan air admission passageway, an air exhaust passageway, valvemeans for obstructing said passageways one ata time, means for shiftingthe valve means to one position and time controlled means-for shiftingthe valves means to the other position. b v y 25.'In combination, apumping chamber having water inlet and discharge valves, an airadmission port, an air exhaust port, valve means for alternatelyobstructingsaid ports one at a time, a fluid pressure motor for movingthe valve means to obstruct the admission port and time controlledmeans. for moving the valve means to obstruct the exhaust port.

26. In combinatioma pumpingchamber 7 her has refilled. v

27.'In combination, a pumping chamber closing having water inletanddischarge valves, a compressed air admission valve, a flu 1dpres-'.su're motor for closing the admission valve upon emptying of thepumping chamber and time controlled means for'ope'ning the admission.valve when the pumping chamber has been'refilled. I a

' 28. In combination, a single cylinder pump comprising a pumpingchamber having water admission and discharge valves,

an exhaust port having a valve'seat,an"ex haust valve adapted to beapplied to its seat when waterhas filled the pumping chamber, andbeing'adapted to be held to its seat by the'pressure of the compressed"air within the chamber, a fluid pressure motor adapted to move the:exhaust valve away from its seat when the water has been expelled fromthe pumping chamber, means to apply the exhaust valve to its seat apredetermined time 7 interval after the escape of pressure from thechamber.

29. In combinatiom'apumping chamber having Water inlet and dischargevalves, means vfor admitting compressed air'to the pumping chamber, anexhaust valve'adapted to be held to its seat by the pressure of'thecompressed air within the pumping chamber,-

a fluid'pressure motor for moving the exhaust valve away from its seatagainst pres sure, SillCl fluid pressure motor having lost motionvconnections with said exhaust valve, said lost motion connectioncomprising "a spring for throwing'the exhaust valve clear of its seatand time controlled means for app y g heexhaus't valve to its seat. 2

In combination, a pumping hamber having water inlet and dischargeva'lves, air

admission and exhaust valves of the puppet type, said valves'lying in.line with each other and being adapted to be moved in unison, a fluidpressure motor for operating said valves, a low level float controllingsaid motor, means for operating the valves in the opposite direction anda time controlled ment governing said latter means. I

In combination, a pumping'chamber having water inlet and dischargevalves, means for'admitting compressed air, to the pumpingchamber,anexhaust valve of the j puppet type adapted to be held to its seat bypressure within the pumping chamber, a fluid pressure motor for movingthe exhaust valve from its seat-against the pressure'of the' fluid inthe chamber, a low level float" controlling the effective applicationoffpres" sure to the motor, Spring means for applying 7 the exhaustvalve to its seat, and a time con j trolled element governing saidspringmeans.

, 32. In' combination, a'pumping chamber having water inlet anddischarge valves,'5

means 'for admitting compressed air to the pump chamber, an air exhaustlvalve adapt ed to -be held tto its seat bygthe pressure within thechamber, a pressure motor elefor opening said exhaust valve againstthepressure, a lost motion'connection between the fluid pressure motorand the exhaust valve, said connection comprising a pair of engagingshoulders normally held apa rt by a spring, a 'low level floatcontrolling the motor toopen the exhaust valve when Water has j beendischarged from the pumping chamber, and time controlled means adaptedto operate substantially at the same, time that the water has refilledthe pump chamher for applying the exhaust valve to its trolled bydischarge, of Water from the pumping chamber for unbalancing said fluidpressures to operatesaid valve means in one direction, and timecontrolled means for making thereturn stroke of the motor to operatesaid valve. means in the other di irection.

34. In combinatioma' pumping chamber having water inlet and dischargevalves, means for admitting compressed air to the pump chamber,an airexhaust valve, a fluid pressure motor element for operating said exhaustvalve, said element being exposed on one side to the pressure within thepump ing'chamber andbeing exposed on the other side totthe pressure "inthe Water discharge line, means controlled by'discharge of Water fromthe pumpi'ng'chamber for unbalancing said pressuresto open the exhaustvalve, and time' controlled means for closing the exhaust valve. I

35'. Ina pump, an air'valve, a pumping chamber, a-fluid pressure motorelement for operating the air valve, normally exposed.

on one sideto the fluidpressure nthe pumping chamber means controlled bythe low, level of the Water withini the pumping chamber for permittingsaid fluid pressure" to become effective to operate the motor elementto.sh ift said valve means, and time controlled means for closing theexhaust valve. y I, .t y v '3. 'combinati on, a pum ing chamber having"water inlet and disc arge valves,

means for admitting compressed air, to the chamber, an; airexhaust'valve adaptedlto be heldito its seat 'bythe'pressure withinthepumping chamber, a fluid pressure motor for opening the exhaust valveagainst the pressure withinthe chamber, and time controlled means forapplying said exhaust valve to its seatQj f I 37, In combination, apumping chamber having water inlet and discharge valves, means foradmitting compressed air to the chamber, an air exhaust valve adaptedtobe held to its seat by the fluid pressure within the chamber, a fluidpressure motor for moving the exhaust valve awayfrom its seat againstthe pressure in the chamber, a low level float controlling the pressuremotor, and a time controlled element for applying theexhaust valve toits seat.

38. In a pneumatic pump, a valve, abalanced fluid pressure motor elementfor operating the valve in one direction, low levelmeans for disturbingthe balance of pressures to initiate movement in said one direction,valve means for exhausting the pressure on one side of the element tocomplete a movement quickly in said one direction, said valve meansbeing governed by said element and time controlled means for making thereturn stroke of the motor.

39. In pneumatic pump, a balanced fluid pressure motor element, lowlevel means for disturbing the balance to initiate movement in onedirection, valve means for exhausting the pressure on the opposite sideof the element to complete the movement quickly, said valve means beinggoverned by said element, spring means for making the return stroke ofthe motor, and time controlled means governing said spring means.

40. In a pneumatic pump, a pumping chamber having water valves, meansfor admitting compressed air, an exhaust valve, a motor for opening saidexhaust valve when water has been discharged from the pumping chamber,said motor having a fluid pressure chamber, atubular connectioncommunicating with the interior of the pumping chamber, a valvecontrolling said tubular connection for trapping fluid under pressure.

in said motor chamber, and a graduated orifice controlling the dischargeof pressure from said chamber.

41. In a pump, a pumping chamber having water valves, an exhaustpassageway, a fluid pressure passageway, valve means for alternatelyclosing said passageways, a motor element Operated in one direction byfluid pressure for shifting said valve means to close the fluid pressurepassageway when water has been discharged from the pump chamber, meansfor trapping fluid under pressure in said motor, and spring means forshifting the valves to close the exhaust passageway, the action of saidspring being controlled by the discharge of the pressure trapped in saidmotor.

42. In combination, a pumping chamber having Water inlet and dischargevalves, an air exhaust valve, a fluid pressure motor above thelevel ofthe liquid in the chamber at low level for opening said exhaust valve, atubular connection controlling the entry of fluid pressure to the motor,means for mainhaving water inlet and discharge valves, an

anexhaust valve, a fluid pressure motor above the level of the liquid inthe chamber at low level for opening said exhaust valve, a tubularconnection controlling the entry of fluid pressure to the motor, meansfor maintaining a water seal about the end of said connection to insurethe discharge of water into said motor, and a low level valvecontrolling the discharge of water into said motor through saidconnection, and a spring for making the return stroke of the motor.

44. In combination, a pumping chamber having water inlet and dischargevalves, an air exliaust valve, a fluid pressure motor above the level ofthe liquid in the chamber at low level for opening said exhaust valve, atubular connection controlling the entry of fluid pressure to the motor,means for maintaining a water seal about the end of said connection toinsure the discharge of water into said motor, a low level valvecontrolling the discharge of water into said motor through saidconnection, and a spring for making the return stroke of the motor, saidmotor having a graduated orifice for permitting the dissipation of thefluid pressure admitted to the motor.

45. In a pneumatic pump, a pumping chamber having water inlet anddischarge valves, means for admitting compressed air to the pumpingchamber, an exhaust valve adapted to be held to its seat by pressurewithin the pumping chamber, a fluid pressure motor for moving theexhaust valve ofl? its seat against the pressure within the chamber,said motor being located above. the low water level of the pumpingchamber, a connection between the motor and the interior of the chamber,said connection being invariably water sealed, and a low level valvecontrolling the effective application of pressure to the motor. i 46. Ina pneumatic pump, a pumping chamber having water valves, means for admitting compressed air, an exhaust valve adapted to be heldto itsseat'by pressure within the pumping chamber, a fluid pres sure motorhaving a connection with the interior of the pumping chamber for openingsaid exhaust valveagainst the pressure within the pumping chamber, alost motion connection between saidexhaust valve and said motor forpermitting the exhaust valve to be moved ahead of the'motor after thevalve has been cracked from its seat, a low level float controlling theoperation of said '47-, In a pneumatic pump, a pumping chamber havingWater inlet and discharge valves, means for admitting compressed airtofthe pumping chamber, an exhaust valve adapted to be opened when waterhas been s expelled from the pumping chamber, a fluid pressure motor foroperating said exhaust valve, a low level float governing the operationof said motor,said motor comprising a chamber and a movable Wall for thesame, a fluid admission passageway for the motor, a valve controlledbyoperation of the motor to open the exhaust valve to close the motorchamber admission passageway, and

spring means connected between the mov able wall of the motor and saidvalve for holding said valve over the motor admis sion passageway untilthe pressure has been discharged from the motor chamber, said chamberhaving an orifice for permitting the discharge of pressure therefromunder the influence of said spring and means for restoring the exhaustvalve to its seat after pre'ssurehas been discharged from the motorchamber. V

48. In a pumpof the class. described, a head for thepump having anexhaust valve, a pressure motor below said exhaust valve,

said motor having a pressure chamber with.

anopening belowthe exhaust valve, a movable member for the motor, meanscontrolled by low level conditions within the pump for permitting theeffective application of prcssure'to the motor, a spring cage connectedto the movable motor member, a stem connected to the'exhaust valve, aspring lying between the cage and the exhaust valve, said stem and cagehaving interening/the return stroke of said element and time controlledmeans governing the operation of-said last named means.

5 0. In a pneumatic pump, a balanced fluid pressure motor elementexposed on both sides to: the pressure within the pumping chamber, lowlevel means for disturbing the balance to initiate movement "of theelement In one direction, valve means actuated by said initial movementfor exhausting thepressureonone side of the element to com- 7 plete saidn tiated movement, and means 1npressure Within the pumping chamber,

means controlled by low level for disturbing the balance to initiatemovement of the element in one direction, valve means operated by saidinitial movement for further unbalancing the pressure to complete theinitiated movement, means operated by said completed movement governingthe exhaust of pressure causing the movement of the element, and a dashpot controlling the return stroke of the motor. 1 J

52. In a pneumatic pump, a fluid pressure chamber, a movable wallcomprising a motor element for said chamber, a low level valvecontrolling the effective application of pressure to the motor element,a fluid pressure admission passageway for the fluid pressure chamber andafluid pressure discharge passageway for said chamber and valve meanscontrolled by the completion of the stroke in one direction for closingthe admission passageway and means for making the return stroke of themotor element with said valve closed.

53. In a pneumatic'pump, water inlet and discharge valves, means for.admitting compressed air, an exhaust valve adapted-to be held to itsseat by the pressure within the pumping chamber, a fluid pressure motor:t'orpulling theexhaust'valve ofl of its seat when water has beendischarged'from the chamber, said motor having a fluid pressure chamber,a: tubular connection leading into said chamber, a low level valvecontrolling. the discharge of fluid through said tubular connection intosaid chamber.-

, 54. In combination, a pumping chamber having water inlet and dischargevalves,

means for admittingcompressed air to the pumping chamber, an exhaustvalve adapted to be heldto its SGZItZbYtPI't-BSSUIG, a fluidpressuremotor operated by the pressureof the fluid within the pumpingchamber for pulling the exhaust-valve oil" of its seat against pressure,a lost-motion connection between the motor and the valve, a motorchamber for the motor element, atubular connection for admittingpressure to the chamber, and means for ma ntaining a water seal on saidtubular connection, said motor being controlled by low level conditionsfor opening the exhaust valve.

55.111 combination, a pumping chamber having water inlet and dischargevalves, means for admitting compressed air, an exhaust valve adapted tobe held to its seat by pressure within the pumpingchamber, a. diaphragmvfor moving the exhaust valve off of its seat'against pressure, meansfor throwing the valveaway fromits seat after the diaphragm has startedthe valve to open, a tubular connection for the "admission of water tosaid motor diaphragm, a valve controlling the entry of Water to saidtubular connection for operating the diaphragm and a spring for makingthe return movement of the diaphragm; i

56. In a pneumatic pump, a pumping chamber having Water valves, meansfor ad mitting compressed air to the chamber, an exhaust valve, a fluidpressure motor for openin the exhaust valve, low' level floatcontrolIing the initial movement of the motor, means controlled by theinitial movement for accelerating the movement of the motor and asniflle hole or discharge port for permitting. the slow discharge ofpressure from the motor. 1

57. In a pneumatic pump, a pumping chamber having water valves, meansfor admitting compressed air, an exhaust valve adapted to be heldto itsseat by pressure within the pumping chamber, a motor comprisinga chamberand a'diaphragm, a tubular connection for permitting the entry of fluidinto the motor chamber, a low level valve governing the discharge offluid into said-"chamber through said connection, and

a sniflle hole controlling thedischarge of fluid from said motorchamber. i i

58. In a device of the class described, a pumping chamber having waterinlet and discharge valves, means for admitting compressed air to thepumping chamber, an exhaust passageway, an exhaust valve adapted to beheld to its seat by pressure within the pumping chamber, said exhaustvalve governing said exhaust passageway, a fluid pressure motor lyingbelow the exhaust valve, said motor comprising a chamber having atubular connection immediately below the exhaust valve and adapted to beobstructed by the exhaust valve when in open position,

"and a movable member adapted to be moved by differences of pressure toopen the exhaust valve from its seat and to obstruct the tubularconnection of the motor with the pumping chamber, a lost motionconnection betweenthe movable member and the exhaust valve comprisingaspring cage and a stem, anda spring between'the cage and stem, a lowlevel float controllingthe forcing of pressure through said tubularconnection into the chamber'to move the movable member of the motor toopen the xhaust valve and to trap fluid within the motor chamber andmeans for forcing the movable motor member in a direction to close theexhaustvalve, the action of said means upon the exhaust valvebeingdelayed until the lost motion is taken up between the exhaust valve stemand the cage, said action consuming a predetermined amount of timeandbeing' controlled by the olischarge oi the fluid pressure trappedwithin the motor chamber through a sniffle hole or orifice in the walls"ofthe motor 'chamber.

59. In a device of the class described, ,a

motor chamberhaving a tubular connection for the entry of fluidpressure, a diaphragm forming one wall of said cham'ber,a balancingchamber on the other side of the dia- 'phragm, a "relief valve havinga stem extending adqacent the diaphragm member when the diaphragm is inone extreme position, apassageway for admitting pressure to saidbalancing chamber, means controlling the application of a greaterpressure to the motor chamber than to the balancing chamber, means forexhausting the pressure from the balancing chamber comprislng the abovementioned relief valve, a spring for and a time controlled element foroperating the valves in the other direction. 7

61. In a'pump, a pumping chamber having water valves, an air exhaustvalve of the puppet type closing with pressure,'a motor 'for moving theexhaust valve off of its'seat,

said motor being operated by the ifluid pressure within the chamber,means'for trapping apredetermined amount of wateriin the pumping chamberfor operating said motor, and a low level float controlling thedischarge of said water into said motor for '10s opening the'exhaustivalve.

62. In combinat on, a pumping chamber, Water valves, means for admitt ngcompressed air to the'pumping chamber, an exhaust valve", a fluidpressure motor for operating the exhaust valve, means for trapping apredetermined amount of water in the pump chamber, and a low level floatcon- 63. Incombination, a pumping chamber having water valves, means foradmittlng compressed a1r, an exhaust valve adapted to be heldiclose d bypressure within the trolling the discharge of said water into H themotor for opening the exhaust valve.

pumping chamber, a fluid pressure operated motor adapted'to beoperatedvby the pressure within the pumping chamber, means within thepumping chamber for trapping a predetermined quantity of water, saidwaterbeing adapted to be forced into, the pressure motor, and a" lowlevel valve controlling the forcing of said water into the pressuremotor, and lost motion connectron between the exhaust valve and thepressure motor for permittingthe valve to be 1 thrown away from its seatafter it once starts to open. 7

closing of said exhaust valve.

I 65. In'combination, a pump "chamber having water inlet and dischargevalves,-means for admitting motive fluid, a balanced pressure motor, anexhaust valve adapted to be held to its seat by pressure and moved fromits seat by said motor, means controlled by low level of water withinthe pumping chamber for unbalancing the pressures on said motorelement,- and a relief valve on 'ing chamber formovingtheexhaust valveaway from its seat against the pressure in one side of the motorelement, said relief valve opening to the exhaust port on theatmospheric side-of the exhaust valve 66. In combination,- a pumpingchamber having water inlet and discharge valves,:an air admission valve,an exhaust port, an exhau'st valve adapted to closethe port when waterhas filled the pumping chamber and to be held to seat by the fluidpressure in the pumping chamber, a fluid pressure motor controlledby lowwater level in the pumpthe chamber, and aspring adapted to, apply theexhaust valve to its seat when there is vno fluid pressure in thepumping chamber.

67. In a pneumatic pump the combination with a pump chamber and a valvefor admitting compressed air to said pumpchamber, offluid actuated meansfor operating said valve, and means adapted to move said fluid actuatedmeans and said valve to retain said valve in one of its extremepositions when there is no air pressure on the 68. In a pneumatic pumpthe combination of a pump chamber, an air valve, a fluid motorcomprising a cylinder and a piston and means-for permitting water to beforced from the pump chamber to the cylinder to actuate the piston andthe air valve, the cylinder being providedwith a bleed hole in the topthereof.

69. In a pneumatic, pump the combination with a pump cham ber providedwith water inlet and outlet valves, of an air valve and a fluid motorfor actuating-saidair valve,

said motor being connected with the interior of the pump. chamber andmeans for main 'falning-a water seal between the motor and the. air inthe pump chamber for pressure and exhaust;

' 70. In a pneumatic pump the combination with a pump chamber providedwith water inlet and outlet valves, of an air valve and-- a fluid motorfor actuatingsaid air valve, said motor being connected with the interor of the pump chamber, means for maintainexhaus't,and a low level floatgoverning the forcing of the water into the motor to actuate the airvalve. 7

71. In combination, a pumping chamber, a pump chamber having water inletand discharge valves, an air admission valve, an air exhaust valve, apressure motor for opening the exhaust valve and closing the admissionvalve when the water has been dising a water seal between the motor andthe air in the-pump chamber for pressure and charged from the pumpchamber, and a spring for holding the admission valve open and theexhaust .valve closed when there is no pressure on the pump.

72. In combination, a pumping chamber having water inlet and dischargevalves, means for'admitting' compressed air to .the chamber, an exhaustvalve, a pressure motor for opening the exhaust valve when water hasbeen discharged from the pump chamber, means for trapping a body .ofWater in" the pump chamber and a low level floatcontrolling the forcingof said water into the motor to open the exhaust valve; I 73. Incombination, a pumping chamber having water inlet and discharge valves,-"means for admitting compressed air to the chamber, an exhaust valve, apressure motor for 'opening the exhaust valve when water has beendischarged from the pumpchamber, means for trapping a body of water inthe pump chamber, and a low level float controlling the forcing of saidwater into the motor to open the exhaust valve, and means for forcingthe water out of the motor before the exhaust valve isapplied toitsseat.

74. In combination, a single cylinder pump, a source, of compressed air,an air spring connected to the pump and a closed faucet controlleddelivery system connected to the pump and tank, said pump comprisingvalves for liquid, a main air valve mechanism, a pressure motorcontrolled by low level of liquid in the pump to shift the main airvalve to exhaust position and time controlled means governing theclosing of the exhaust. Y

75. In combination. a single cylinder pump, a source of compressed alr,an air spring connected to the pump and a closed faucet controlleddelivery system connected to the pump and air spring, said pumpcomprising valves for liquid, a main air valve mechanism, apressuremotor. controlled b low level of liquid in the pump to shift themain air valve to cut off further admission of compressed air and timecontrolled means for shifting the valve to readmit compressed air.

76. In combination, a pump chamber, valves for liquid, an exhaust valveof the puppet type adapted to be held to seat by pressure, means foradmitting compressed air to the pump chamber, a motor chamber having amovable motor member, a connection between the motor chamber and thepump chamber, a low level control device governing the movement of saidmotor memher by fluid under pressure admitted to the motor chamber, andvalve means for trapping fluid in said. motor chamber to hold theexhaust valve open.

77. In combination, a pump chamber, valves for liquid, an exhaust valveof the puppet type adapted to be held to seat by pressure, means foradmitting compressed air to the pump chamber, a motor chamber having amovable motor member, a connection between the motor chamber and thepump chamber, a low level control device governing the movement of saidmotor memher by fluid under pressure admitted to the motor chamber andvalve means for trapping fiuid in said motor chamber, said motor chamberhaving a leakage port for permitting the escape of said trapped fluid.

78. In combination, a single pumping chamber having Water inlet anddischarge valves, a closed faucet controlled delivery system connectedto said pumping chamber, compressed air admission and exhaust valvemeans, a fluid pressure motor for operating the air valve means and atime controlled element governing said air valve means.

79. In combination, a pumping chamber having Water inlet and dischargevalves, means for admitting compressed air to the chamber, an exhaustvalve, a fiuid pressure motor for opening the exhaust valve, meanscontrolled by loW level in the pumping chamber governing the operationof said motor, and time controlled means for closing the exhaust valve.

In Witness whereof I hereunto subscribe my name this 10th day ofNovember, 1919.

BURTON S. AIKMAN.

